Question: What is the nickname of the Rivne Oblast that was used beginning in 1991?
Paraphrase: Mention the nickname of the Rivne Oblast which was used in the year 1991 beginning?.
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q174187 p:P1813 ?s . ?s ps:P1813 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1991')) }